Geological Society of America

Session 2: Novel and Classical Approaches to Deciphering Records of Precambrian Earth

Tuesday, 19 May 2020
8:00 AM - 11:15 AM

THE TECTONIC CONTEXT FOR THE GOGEBIC RANGE IRON FORMATIONS

Program: Virtual Meeting
Time: 8:00 AM – 11:15 AM

Authors

Athena Eyster Presenting Author
Massachusetts Institute of Technology, Cambridge, MA
Latisha Brengman
University of Minnesota Duluth, Duluth, MN
Claire Nichols
Massachusetts Institute of Technology, Cambridge, MA
Zoe Levitt
Massachusetts Institute of Technology, Cambridge, MA
Kristin Bergmann
Massachusetts Institute of Technology, Cambridge, MA

Abstract

To determine the tectonic context and identify key factors driving iron formation deposition after the Great Oxidation Event, we apply a stratigraphic facies approach and present updated mapping relationships of the Ironwood Iron Formation and the Emperor Volcanics from the Gogebic range. This work is coupled with a compilation of additional outcrops, mine data and core logs. We interpret the datasets to demonstrate that later deformation does not explain the observed thickness changes, but that instead they are consistent with depositional complexities spanning the entire Gogebic range. Our results quantitatively constrain thickness variations along the Gogebic range and tie them to syn-sedimentary faulting along normal faults and half grabens.

Geological Society of America Abstracts with Programs. Vol. 52, No. 5

doi: 10.1130/abs/2020NC-348307

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